In this changelog, we document "large-ish" changes to Iris that affect even theway the logic is used on paper. We also mention some significant changes in theCoq development, but not every API-breaking change is listed. Changes marked[#] still need to be ported to the Iris Documentation LaTeX file.

* [heap_lang] No longer use dependent types for expressions. Instead, values carry a proof of closedness. Substitution, closedness and value-ness proofs are performed by computation after reflecting into a term langauge that knows about values and closed expressions.

user-chosen predicate to define the configurations we can reduce to; they directly relate to the operational semantics. This is equivalent and much simpler to read. Due to a lack of maintenance and usefulness, lifting lemmas for Hoare triples are removed.